User Manual

AS4000 Survey Tool

605-0000-429

DLP-004

Issue 1.6. Date 1/9/99

Page 3 of 4

7. If the PC value indicates a fade margin of less than 10dB. Use a second pan to accurately

find the maximum for both AGC and PC. Pan slowly and limit the panning to approximately

± 15° from the initial position to prevent losing the link. If the link drops restore to an

approximate maximum and repeat the panning process. Record the AGC and PV values

again if different form first pan. and estimate the angle between CRU and wall it is to be

mounted on.

8. If the link fails to acquire check the fade margins (see below). If the signal strength is

insufficient for the CRU to acquire check that the panning angle does not violate the site

selection criteria set out in TAD-004. If the criteria are violated another position needs to be

found to mount the CRU.

5. BER Testing

1. Network Access to the 64kbit/s loopback for BER testing has to be arranged to support link

BER testing (see Figures 1, 2, and 3). The looped timeslot is TS31 when using RW15 ( on

modem card 8).

Normal Switch

Cross Connect

CT Rack

Survey Tool

CRU Head

BER

Test Set

FA Modem

Shelf

Breakout

Mux

Pick Off

TS31

Figure 15. BER testing using a Breakout Mux